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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 19 — Jul. 1, 2009
  • pp: 3742–3749

Laser speckle reduction via colloidal-dispersion-filled projection screens

Falko Riechert, Georg Bastian, and Uli Lemmer  »View Author Affiliations

Applied Optics, Vol. 48, Issue 19, pp. 3742-3749 (2009)

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We use projection screens filled with colloidal dispersions to reduce laser speckle in laser projection systems. Laser light is multiply scattered at the globules of the colloidal dispersion’s internal phase, which do Brownian movement. The integration time of the human eye causes a perception of a reduced laser speckle contrast because of temporal averaging. As a counteracting effect, blurring of projected images occurs in the colloidal dispersion, which degrades image quality. We measure and compare speckle reduction and blurring of three different colloidal dispersions filled into transmission screens of different thicknesses. We realized a high speckle contrast reduction at simultaneously low blurring with a thin screen filled with a highly scattering colloidal dispersion with forward-peaked scattering. We realize speckle contrast values below 3% at acceptable blurring.

© 2009 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(030.4280) Coherence and statistical optics : Noise in imaging systems
(030.6140) Coherence and statistical optics : Speckle
(290.4210) Scattering : Multiple scattering
(290.7050) Scattering : Turbid media
(290.2558) Scattering : Forward scattering

ToC Category:

Original Manuscript: April 30, 2009
Manuscript Accepted: June 6, 2009
Published: June 24, 2009

Falko Riechert, Georg Bastian, and Uli Lemmer, "Laser speckle reduction via colloidal-dispersion-filled projection screens," Appl. Opt. 48, 3742-3749 (2009)

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